Canon only released one FF body in the year, and that was the RP. If you look at the graphics, you'll see Canon's FF unit sales are actually up, and value is down, indicating they sold a ton of RPs, even though the more expensive DSLR bodies probably weren't in high demand. Which is to be expected, as they are near their end of life, with the 1DX III and likely even the 5D V coming next year.
If I were an investor, I'd look at these figures a lot more, before concluding much. In any case, I find it misleading to say that Canon is suffering so much here, as clearly Nikon is in a lot more trouble.
Here's a better coverage of the report and the original btw:
昨年秋に始まったフルサイズミラーレス一眼の戦い。1年あまりが経過した現段階では、ソニーが圧勝している。
www.bcnretail.com
As indicated by the graphics, the numbers from the report cover the year from November 2018 to October 2019.